Spark plug electrodes extension Suitable for Peugeot 403 404 504 J7. Renault R16. The extension

fits also on Citroen DS + HY. With Citroen DS can be, that the rubber protection from the ignition cable, must cut off a little bit. It can be, that you must change the hole from the spark plug locking cap to 10mm. Normally no changes are necessary. Just opposite DS, the extensions from the Peugeot method is an significant improvement, because the electrode is fully insulating!